-$Cambridge: exim/doc/doc-misc/WishList,v 1.37 2005/06/07 15:36:47 ph10 Exp $
-
EXIM 4 WISH LIST
----------------
+This Wish List is now obsolete. The items it contains have been imported into
+the Exim Bugzilla, which is where all new wishes should be added. This file is
+no longer maintained. Some day it should be deleted.
+
+
+===============================================================================
Even when it was first released, Exim 4 had a Wish List because not all the
things suggested for it were implemented. The list has not stopped growing...
mark david mcCreary
"I use the syntax_errors_to feature to email a copy of the error message.
-It would be helpful to have the X-Failed-Receipients header in there,
-identifying which addreses(s) are the problem, so that I don't have to
+It would be helpful to have the X-Failed-Recipients header in there,
+identifying which address(es) are the problem, so that I don't have to
parse the body of the email message to figure out which addresses."
------------------------------------------------------------------------------
So several warnings could be generated as the mailbox got bigger and bigger.
------------------------------------------------------------------------------
-(146) 15-May-2000 M Allow SMTP error codes in retry rules
-
-This would allow special handling of certain errors from certain hosts. In
-particular, it would allow failing of certain 4xx codes.
-
-This is now available for 4xx responses to RCPT commands. Is anything more
-needed? Apparently, yes; there's been a request for a similar feature for MAIL
-commands.
-------------------------------------------------------------------------------
-
(148) 15-May-2000 S Warn recipient if message rejected for quota excession.
Heinz Ekker
address?
------------------------------------------------------------------------------
-(172) 11-Sep-2000 S Allow file/directory in appendfile to override
-"Michael J. Tubby"
-
-When appendfile is called from forward or filter files, it ignores file or
-directory settings. Maybe they should override. The path set by the forward or
-filter is available in $address_file these days, so it could be used to create
-a longer path.
-------------------------------------------------------------------------------
-
(173) 18-Sep-2000 S A way of doing lsearches with EOL terminated keys
Jason Robertson
exim_dbmbuild to make them into DBM files.
------------------------------------------------------------------------------
-(174) 19-Sep-2000 S A way of using a different port for fallback hosts.
-Dean Brooks
-------------------------------------------------------------------------------
-
(181) 10-Nov-2000 S Compile-time options for ignoring Sendmail options
So that new ones could be accommodated easily.
headers_remove = "X-*:Additional-header"
------------------------------------------------------------------------------
-(188) 02-Jan-2001 S Make pipe timeout a temporary error
-Georg v.Zezschwitz
-
-A way to make a timeout into a temporary error.
-------------------------------------------------------------------------------
-
(190) 03-Jan-2001 M Multiple message operations in eximon
------------------------------------------------------------------------------
might have. At ACL time, one would need to verify the recipient, and determine
that it routed to host X.
-. A new lookup library that operates on a specially prepared file of IP
-addresses and masks so that a single "lookup" yields a yes/no answer. This
-should be a freestanding thing - needs a utility to build the file from a list.
-
. People want to change the wording of messages; can we find an efficient way
of allowing this? (Maybe put all messages into a separate module?) The problem
is not in the messages themselves, but in the values that get inserted into
. Implement randomize for ldap/sql servers.
. Add an option for ETRN that says "wait for the command to finish, and use its
-stdout as the SMTP response."
+stdout as the SMTP response." // A serialized ETRN now does the waiting, but
+there is as yet no way to use the status. //
. -odsomething for "ignore retry when doing immediate delivery".
it were 4xx. Or possible add a sophisticated "after command X, treat xxx as
yyy".
-. A way of rewriting addresses in non-standard header lines such as
-Mail-Followup-To.
-
. Global option to enable initgroups() for exim uid. Default off.
. When verifying a sender, should it be rewritten with any T rewrites, because
. Options and/or a utility to enable non-privileged users to view the queue
(e.g. -bpp), manipulate their own messages, etc.
-. Specify a port along with a host in a route_list.
-
. A generalized "From" escaping scheme that also escapes >From so that the
whole thing can be reversed.
John W Baxter
May be tricky, because at the higher levels, the format of the query is not
-understood.
-------------------------------------------------------------------------------
-
-(8) 01-Jan-02 S Expand once_repeat in autoreply
-John Jetmore
+understood. // There is now a fudge that works in some cases. See ChangeLog
+4.51/PH/10. //
------------------------------------------------------------------------------
(9) 01-Jan-02 S Headers as well as body in file for autoreply
Is this really worth it? A per-transport value is also suggested - that would
mean remembering the value with each failed address and taking a minimum or
-a maximimum (which?).
+a maximum (which?).
------------------------------------------------------------------------------
(24) 21-Feb-02 ? A way of testing TLS using -bh
data transmitted for a non-delivery attempt.
------------------------------------------------------------------------------
-(69) 03-Jul-02 T Log selector to log whoson checs
+(69) 03-Jul-02 T Log selector to log whoson checks
Matt Bernstein
"I'd quite like a log_selector option which could spot you'd done a whoson
copies to the same address.
------------------------------------------------------------------------------
-(73) 17-Jul-02 M Match a list from within a condition
-
-e.g. ${if matchdomain {$domain}{+domainlist} ...
- ${if matchhost {$sender_host_address}{1.2.3.4/10:2.3.4.5/16}...
-
-Thought needed about how to handle host names. This may be too messy to specify
-cleanly.
-
-22-Apr-04: Implemented for domains, addresses, and local parts. Hosts are
-too messy!
-
-The only sensible approach seems to be to allow IP address arguments only.
-Anything else should be diagnosed as an error. However, if a name appears in
-the list, a PTR lookup should be done. This may require a lot of refactoring
-in the code, because of the current assumption that were are (almost) always
-dealing with THE sending host.
-------------------------------------------------------------------------------
-
(74) 22-Jul-02 M Extend -bV to do more semantic checking
For example, diagnose "local_hosts" that should probably be "+local_hosts".
Peter A. Savitch
OpenLDAP 2.1 is going to be more popular (2.1.9 is available with many
-bug fixes). TLS-enabled LDAP is an interesting and usefull thing.
+bug fixes). TLS-enabled LDAP is an interesting and useful thing.
I can try to implement some things and send the patches, like with
ldapi.
Suggested patch supplied.
------------------------------------------------------------------------------
-(171) 23-Jun-03 S Option to make timeout a soft failure on pipe transport
-
-------------------------------------------------------------------------------
-
(172) 23-Jun-03 M Option to make SQL query to specific server
------------------------------------------------------------------------------
different kinds of verify failure.
------------------------------------------------------------------------------
-(196) 30-Sep-03 S A way of detecting whether it was HELO or EHLO in the ACL
-
-$received_protocol isn't reset until after the command is accepted (which
-seems right), and $smtp_data shows only the arguments. Maybe $smtp_command?
-------------------------------------------------------------------------------
-
(197) 30-Sep-03 S MACROS_DROP_PRIVS and ALT_CONFIG_DROP_PRIVS
Now that alternative configurations can be restricted to certain directories,
that it can be used as a safety-net while testing configurations. Instead of a
local bounce, the message stays on the queue; instead of 5xx SMTP responses,
4xx ones are given.
-
-The ability to do the opposite - turn 4xx into 5xx under certain circumstances
-might also be useful (e.g. after a certain time). This might best be done by
-extending the retry logic to recognize 4xx as a special error. (This is now
-done.)
------------------------------------------------------------------------------
(202) 10-Oct-03 S -bvsomething to do a callout after the verify
------------------------------------------------------------------------------
(209) 31-Oct-03 S a way of making crashes in pipe commands temporary errors
-
------------------------------------------------------------------------------
(210) 31-Oct-03 S runtime option to change the daemon name used for tcprwappers
See also 333.
------------------------------------------------------------------------------
-(214) 05-Nov-03 S Put the wild part of local part prefix/suffx in variables
+(214) 05-Nov-03 S Put the wild part of local part prefix/suffix in variables
Unfortunately, this isn't quite as trivial as it seems.
------------------------------------------------------------------------------
-(215) 14-Nov-03 S A way of turning off message-submission fix-ups
-
-Globally, and perhaps also via an ACL control so that it can be done on a
-per-message basis. Is this still needed? Since this item was added to this
-list, default fixups for non-local messages have been removed, and control =
-submission has been added.
-------------------------------------------------------------------------------
-
(215) 26-Nov-03 M/L Conversion of IDNA domain names for logging
IDNA (RFCs 3490-3492) converts domains names containing non-ASCII characters
changed.)
------------------------------------------------------------------------------
-(216) 27-Nov-03 S Option to bounce if required TLS doesn't happen
-
-This is for the smtp transport with hosts_require_tls set. Currently, it
-defers. Possibly the best approach is to make the error one that can be seen by
-the retry logic.
-------------------------------------------------------------------------------
-
(217) 27-Nov-03 M A function to pass back variables from Perl
This is a function that can be called from Perl, to take a name and a value and
(236) 02-Feb-04 S String in local_scan that's added to the binary version string
------------------------------------------------------------------------------
-(237) 02-Feb-04 M Add_header in ACLs because "message" is overloaded
-
-This would be useful for verbs where "message" is an error message. See also
-333.
-------------------------------------------------------------------------------
-
(238) 05-Feb-04 S ${address to handle multiple addresses
At present, ${address expects to see just one address. An extension would let
both of them.
------------------------------------------------------------------------------
-(286) 21-Jul-04 M Distinguishing a larger number of errors
-
-For instance, detecting "connection reset by peer" (ENETRESET or ECONNRESET)
-might be useful.
-------------------------------------------------------------------------------
-
(288) 10-Aug-04 M Option for verify to require MX
e.g. verify=sender/require_mx
(292) 13-Aug-04 M Overall timeout for message reception
-A client could in priciple keep an SMTP connection open for a very long time by
+A client could in principle keep an SMTP connection open for a very long time by
trickling in data very slowly. Also, after message_size_limit is exceeded, Exim
continues to swallow the data (though it does not write it to disk) until the
end is reached. Again, the connection could be held open for a very long time.
solutions with a similar requirement."
------------------------------------------------------------------------------
-(320) 03-Mar-05 T Options to control daemon retry binding
-
-Currently the daemon tries 10 times at 30-second intervals to listen on an IP
-address. The wish is for options to control these numbers.
-------------------------------------------------------------------------------
-
(321) 07-Mar-05 S Run an ACL on a sync error
... and possibly "accept" or "deny" it.
These are the main previous items:
Exim 3 Wish List: 41, 85, 149, 187.
-Exim 4 Wish List: 55, 62, 63, 160, 212, 237, 270, 314, 328.
+Exim 4 Wish List: 55, 62, 63, 160, 212, 270, 314, 328.
------------------------------------------------------------------------------
(334) 07-Jun-05 M Support for messages larger than 2G
This is probably a longish-term thing at the moment. Quotas over 2G are now
supported, but not individual messages; no doubt one day this will be wanted.
------------------------------------------------------------------------------
---- HWM 334 ------------------------------------------------------------------
+
+(336) 16-Jun-05 M Show recipient(s) after header check failure
+
+The mainlog line for "There is no valid sender in any header line" shows the
+sending host and the envelope sender, but does not show any recipients. There
+has been a request to show recipients. Presumably this should be on some new
+log selector, and it must have a cutoff maximum number of recipients. NOTE: the
+data in the reject log does show the envelope recipients as part of its
+additional data.
+------------------------------------------------------------------------------
+
+(337) 29-Jun-05 S Add "defer" to $recipient_verify_failure
+
+This is for when defer_ok was set when verifying recipients. Since this isn't
+for a failure, we probably also need "ok" for the non-fail case.
+------------------------------------------------------------------------------
+
+(338) 14-Jul-05 M Change to Bind 9 API
+
+Exim uses the original API for calling the DNS resolver. There is a newer API
+available, and noises are being made in some OS that compatibility with the old
+API is going to be dropped. Nevertheless, there are sure to be systems about
+for ages that require the use of the old API. Therefore, we will have to
+implement not only an interface to the new API, but a backwards compatibility
+feature. It would be nice if this was automatic.
+------------------------------------------------------------------------------
+
+(339) 28-Jul-05 S Log name of maildir file
+
+This wish is for an option to log the name of the file that is written in
+maildir format (e.g. time.pid.host).
+------------------------------------------------------------------------------
+
+(340) 30-Aug-05 M Match more than one item
+
+match_address, for instance, matches one address to a list. The wish is to be
+able to supply two lists; for each address in the first list, search the
+second. Maybe something like ${match_any{...}{...}} is needed.
+------------------------------------------------------------------------------
+
+(341) 15-Sep-05 S Add /return_path_retain to submission mode
+
+This would re-instate the behaviour prior to change 4.52/PH/04.
+------------------------------------------------------------------------------
+
+(342) 26-Sep-05 T Log and maybe defer odd values for condition pre-condition
+
+Odd values for "condition" in an ACL cause it to defer. In a router, they are
+treated as "true". At least they should be logged in a router, and perhaps they
+should also defer, for compatibility with ACLs.
+------------------------------------------------------------------------------
+
+(343) 03-Oct-05 M A query-style lookup for scanning flat files
+
+The natural syntax for this would be to use a regex, like this:
+${lookup regex{/some/file regex}{found-string}{not-found-string}}
+However, it would be natural to want to use $1 etc in the found-string; this
+would be hard because of the lookup caching (if repeated, the lookup won't
+actually be done and therefore the numerical variables won't be set), and in
+any case, even without caching (and it could, I suppose, be disabled for this
+lookup) those variables are not in the right storage pool even if they were
+preserved after the lookup.
+
+An alternative approach might be to implement something like this:
+
+ ${scanfile{/some/file}{sub-expression}}
+
+where the sub-expression is expanded for every line in the file, with each line
+in turn being put into $value. This is like a conditional ${readfile, and in
+fact ${readfile could be written using ${scanfile. It would be nice to find a
+way of stopping the scan once something has happened. The only thing I can
+think of is to invent a variable that changes when scanning a line generates
+some non-null text, and then always to stop on a forced failure. That would
+allow expressions like this:
+
+ ${scanfile{/some/file}
+ {
+ ${if eq{$generated}{}{${if match{regex}{$value}{something}}} fail}
+ }}
+
+It's all rather clumsy. Once a line has matched and generated some text, the
+next iteration would stop the scan. Another thought: maybe use $scanline
+instead of $value (to save confusion) and have $scantext containing everything
+that's been generated so far. That sounds pretty flexible.
+------------------------------------------------------------------------------
+
+(344) 10-Oct-05 M Make debug_print work in authenticators
+------------------------------------------------------------------------------
+
+(345) 14-Oct-05 M Standardize rejection messages
+
+"The parsing for rejection lines is a bit of a mess, and fairly
+unmaintainable. Do you think it would be possible to standardise
+rejection/refusal log messages? How about something like:
+
+(<ID>|16 Spaces) *< (Connection|MAIL|RCPT|HELO|EHLO|DATA) rejected (from
+<Address>)?: <Reason> (\(<Detail>\))?"
+------------------------------------------------------------------------------
+
+(346) 20-Oct-05 S Set $domain and $local_part in retry matching
+
+Currently, these variables are unset. Make it like rewrite matching.
+------------------------------------------------------------------------------
+
+(347) 15-Nov-05 M Arrange to expand data from wildlsearch
+
+This would allow keys that are regular expressions to set up numerical
+variables that are included in the data. This has to be done inside the lookup
+code, because of caching. Probably means we have to invent ewildlsearch and
+enwildlsearch.
+------------------------------------------------------------------------------
+
+(351) 31-Mar-06 ? Allow some/all/a few internal variables to be set
+
+The original idea was to allow "set authenticated = x" to pretend a connection
+is authenticated after other conditions are true. This can, of course, be
+packaged up using macros in other ways. Setting other variables could cause
+problems.
+------------------------------------------------------------------------------
+
+(352) 04-Apr-06 S Add +accept_defer for host lists (and maybe others)
+
+At present, a defer causes a delivery defer. For non-critical ACLs there are
+times when it may be better to accept. See also 226 and 289.
+------------------------------------------------------------------------------
+
+(354) 30-Jun-06 ? Extensions to SMTP error codes
+
+A number of ideas arose following a discussion on the mailing list. I record
+them here so that they don't get lost. The motivations were to support the 551
+bounce code and enhanced status codes. Suggestions are to add a new ACL
+feature, possibly one of:
+
+ errorcode = 511
+ control = errorcode=551
+ message = 551 xxxx
+
+where in the last case, it's recognized by being 3 digits. In all cases, the
+first digit must be "right" for the circumstance - ignore or fault if not?
+
+To handle ESC, perhaps a new variable called $smtp_errorcode, settable by an
+option in a router when it fails, would do the trick. It could be used in any
+of the above modifiers.
+------------------------------------------------------------------------------
+
+(355) 30-Jun-06 ? Facility to permit experiments with SMTP extensions
+
+This is what was suggested:
+
+- adding some expansion variables: $ehlo_extensions (which will
+ hold the remote server supported smtp extensions announced
+ in the ehlo) and $rcpt_arguments with any RCPT extra argument
+
+- a main configuration option for adding ehlo extensions to the
+ ehlo response, like:
+
+ extra_ehlo_extensions = XFOO : XBAR
+
+- a extra option for the smtp transport to add arguments to
+ the RCPT TO command, like:
+
+ rcpt_args = FOO=BAR (will make exim issue RCPT TO:<a@b.c> FOO=BAR
+ when delivering that message)
+
+- a new acl for unknown smtp commands
+
+This should be very simple to implement and will allow to make
+some experiments and implement custom extensions, i.e. one to
+known if remote client will redirect on 551 or not. Also the acl
+for unknown smtp command could be used for other purposes, like
+to detect and react to some kiddies that send things like
+http://... on the smtp port.
+------------------------------------------------------------------------------
+--- HWM 355 ------------------------------------------------------------------
---------------------------- End of WishList ---------------------------------
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